Gamow-Teller (p,n) and (n,p) strength in a dressed extended random phase approximation

Induced forces of second order in the nucleon nucleon G-matrix interaction are included in a random phase approximation (RPA) type formalism with dressed single-particle propagators. The predictions of a considerable amount of Gamow-Teller (n,p) strength for magic nuclei with neutron excess, found in earlier dressed RPA calculations, are not modified by the induced forces. Also the distribution of (p,n) strength is only a little affected by the induced interactions. It is therefore concluded that the relatively simple dressed RPA method is a suitable one to calculate excitation strengths.